Note: Taxonomy is from 1914 photo catalog documentation. In F.P. Keen's Cone and Seed Insects of Western Forest Trees (USDA Technical Bulletin 1169), this image is Figure 53 on page 149. The caption reads, "Larva, prepupal larva, pupae, and pebble-covered cocoons of Dioryctria abietella from Douglas-fir cones."
Photo by: John E. Patterson
Date: September 1914
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.
Source: Bureau of Entomology Collection; La Grande, Oregon.
To learn more about this photo collection see:
Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of forest insect investigations on the Pacific Slope, 1903-1953. Part 2. Oregon and Washington. American Entomologist, 48(3), p. 178-185.